Gluten Free Chocolate Cake

I've been trying out a Gluten Free diet, and now I've decided to try reduced gluten, so about half my baking is gluten-free, that means finding good gluten free recipes that don't have that gluten free taste. I found it with this cake.

Cake:
1 1/2 cup gluten free flour
1/2 cup gluten free cornflour
2/3 cup cocoa
2 tsp baking powder
1 tsp bicarb soda
1 tsp xanthan gum
2 eggs
1 1/2 cups sugar
50g margarine, melted
200g vanilla yoghurt
2/3 cup Milk

Icing:
1 cup Icing Sugar
1 Tbsp cocoa
30g Margarine
1/2 tsp Vanilla Essence
1 tsp boiling water

Cake1. Sift the flours, cocoa, baking powder, bicarb soda, and xanthan gum into a large mixing bowl.
2. In a medium mixing bowl, mix eggs and sugar until thick and foamy.
3. Add melted margarine, yoghurt, and Vitasoy Soy Milky Vanilla into egg mixture, stir until well combined.
4. Pour this mixture into sifted flours. Beat with a metal spoon for 1-2 minutes.
5. Pour cake batter into greased pan, bake in pre-heated oven for approximately 40 minutes or until firm to touch (a skewer inserted into the centre should come out clean).
6. Allow to stand for five minutes. Remove from pan and place on wire rack to cool. Top with icing when cool.
Note: Xanthan gum can be purchased in the health food aisles of major supermarkets, or health food stores

Icing1. Into a small mixing bowl, sift icing sugar and cocoa. Add margarine and vanilla essence. Add water a little bit at a time, mixing until smooth and thick with a knife.
2. Use a knife (dipped occasionally in warm water) to spread over cooled cake.